-48.29% is the change from 820 to 424
Calculation steps:
[( 424 - 820 ) ÷ 820] x 100 = -48.29%
Formula
Percentage change = [(424 - 820) / 820] x 100
Subtract the new number by the original number
424 - 820 = -396
-396 ÷ 820 = -0.48292682926829267
-0.48292682926829267 x 100 = -48.29%